Preparation method of activated carbon fibers
A fiber activated carbon, carbonized fiber technology, applied in the direction of fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of reducing adsorption performance and air permeability, impact of protective performance, local strength not improving, etc.
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Embodiment 1
[0049] Take 29.36g of polyimide cloth, put it into a stainless steel reaction tube with an inner diameter of 68mm, and put it under 99.999%N 2 Under protection, room temperature rises to 200°C for half an hour; 200°C to 300°C for one hour, constant temperature for one hour; 300°C to 400°C for one hour, constant temperature for one hour; 400°C to 600°C for one hour, constant temperature for one hour; stop Pass N 2 , and then add water to the tube (the rate of water addition is 10.15 ml / g sample * hour), activate for 10 hours, when the temperature drops to 300°C, stop adding water and turn on N 2 Bring to room temperature. Finally, the yield of the measured product is 21.9%, and the specific surface area is 900m 2 / g, stretching lightly 2.43MPa.
Embodiment 2
[0051] Take 11.7g of polyimide felt, soak it in 300ml, 0.5% ammonium phosphate solution for one hour, take it out and drain it, then put it into a 68mm stainless steel reaction tube, and put it in 99.999%N 2 Under protection, rise from room temperature to 250°C for half an hour and keep the temperature constant for one hour; from 250°C to 300°C for half an hour and keep the temperature constant for one hour; ℃ and 700 for one hour each, and after the completion of carbonization, drop to room temperature. Activation is at N 2 Under the atmosphere, rise to 250°C for half an hour, keep the temperature for half an hour, then rise to 650°C for half an hour, stop N 2 Add water, activate at 650°C for 6 hours, add water at a rate of 4.69ml / g sample*hour, when the temperature drops to 300°C, stop water and turn on N 2 , and cooled to room temperature. The final measured product yield is 31.6%, and the specific surface area is 1080m 2 / g, tensile strength 0.51MPa.
Embodiment 3
[0053] Get 34.84g of polyimide cloth, put it into a stainless steel reaction tube with an inner diameter of 39mm and pass it through N 2 Under the protection of the temperature rise to 200°C for half an hour, then rise to 300°C and 400°C in one hour respectively, and keep the temperature for one hour, and raise the temperature from 400°C to 700°C for two hours, and keep the temperature for one hour to complete the carbonization. The activation was performed at a temperature of 675° C. for four hours, and the rate of adding water was 397 ml / h. The yield of the product measured at last is 10.4%, and specific surface area is 1357m 2 / g, tensile strength 1.11MPa.
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